ACADEMY OF SCIENCES. 281 



viated by a sufficient elevation of the compass as practised upon 

 iron ships. 



Mr. Gibbes remarked that the plant known to the settlers along 

 the San Joaquin as the " Wild Artichoke," is Lycoj^us Eiiropceiis, 

 commonly termed the Water Horehound. The resemblance of the 

 thickened runners to the Jerusalem artichoke, suggested the name 

 Wild Artichoke. The two plants are widely separated botanically 

 — one belonging to the Lahiatre, or mint family ; the other is the 

 Helianthus tuberosus of the natural order Compositae or Aster 

 family. This last must not be confounded with a composite plant, 

 the flowering heads of which are sold in our markets as artichokes. 



Mr. Gibbes also referred to a species of Sagittaria, presented by 

 him, which he collected on the tule lands bordering the San Joaquin 

 River, as interesting, inasmuch as it enabled him to determine a 

 plant, the tubers of which he had often seen in the Chinese markets, 

 but never was able to get specimens of the growing plant. He sup- 

 posed it to be an introduced vegetable from China ; it is, however, 

 a plant indigenous to California, and is also found in many parts of 

 the United States. It is, probably, S. variabilis, which furnishes a 

 half-dozen varieties. In referring to the literature of this plant, he 

 found no author referring to the tuberous character of the roots, 

 except in one of the reports of the Pacific Railroad surveying 

 parties, where they are said to be eaten by the Indians, who term 

 them " Wapatoo.^^ 



Prof. E. S. Carr read an abstract from an unpubUshed paper by 

 John Muir, describing living glaciers, discovered by the latter gen- 

 tleman in the canons of Tuolumne county. 



Descriptions of Three New Species of Crustacea, Parasitic 

 on the Cetacea of the N. W. Coast of America.* 



BY W. H. DALL, U. S. COAST SURVEY. 



Genus Cyamus, Lam. 



Cyamm Lam. Syst. An. s. Vert. p. 166. Bate& Westwood, ii, p. 80. 



Larunda and Panope. Leach. 



Ci/amus Scammoni, n. sp. J Body moderately depressed, of an egg ovate 

 form ; segments slightly separated. Third and fourth segments furnished with 

 a branchia at each side. This, near its base, divides into two cylindrical fi!a- 



* Printed in advance, November 9, 1872. 



